Contents

UFC 66's main event was a championship fight with two of the UFC's biggest light heavyweight stars, Light Heavyweight Champion Chuck Liddell defending his title against former champion Tito Ortiz. This fight was first announced by Ortiz at the UFC 63 weigh-ins on September 22, 2006.[4]

The event was the UFC's first show at MGM Grand Arena since UFC 56, and was nearly sold-out, producing the highest live gate revenue in North American mixed martial arts history,[1] extending the previous record at UFC 57 by over $2,000,000 (USD). At the time, it was estimated to be the UFC's biggest pay-per-view success with just over 1 million buys.[6]

^This bout aired on the PPV broadcast following the Griffin vs. Jardine fight. After the fight Alves tested positive for spironolactone.[7] He was fined $5,500 by the NSAC and suspended for eight months.[8] Alves is the first fighter in Nevada to ever test positive for a diuretic.

^This bout aired last on the PPV broadcast following the Liddell vs. Ortiz fight.